#include <stdio.h>

int main() {
    int a = 0, b = 1, c = 0, d = 20;
    if (a) 
        d = d - 10;
    else if (!b)
    if (!c)
    d = 15;
    else
    d = 25;
    printf("d = %d\n",d);
    return 0;
}